Experts help

Welcome. Try to locate customer service of the manufacturer. Guessing, the top black and the white connector may have some undisclosed digital programming function.

No.
The SPI flash memory with the songs are stored on the chip with the WinBond brand name. You don't know the audio format, the microcontroller accessing this memory doesn't know where your new songs are located or their titles or size - we don't know how much extra room is available on the chip for more songs. And the user interface doesn't know more songs have been added so may not offer access to them. Some topics listed may be less overwhelming to handle but that depends on how generic the microcontroller handles the data stored on the memory chip and whether everything is just byte streams and start/stop addresses are in the micro ontroller firmware vs an actual file system on the memory chip and all songs would be displayed as a list (but we still don't know the audio format.

Thank you sir for your reply.
I don't want to upload new sound to the memory I want to connect a MP3 player for example and use it as amplifier with load sound output .
thanks again

Your gonna have to find the input connections of the amplifier, install a switch and a jack.

Pin 12 of U1 on your board at page 24 of ---> https://datasheetgo.com/wp-content/uploads/2020/10/TPA3110D2.pdf
seems to be the audio input if you want to feed your audio to use the amplifier stage only.




But I would prefer by far to get a separate additional amplifier for your own audio source, there is maaaany flavors in the market as these and bare boards also :

Thank you Sir , I connect it to Pin 12 it works perfect . God Bless you